Question

which of the following will give Residue on filter paper water + CU S o4 water + NaCl water + chalk water + ammonium chloride​

Answer 1

Chalk+ water because chalk is insoluble in water whereas Copper Sulphate, Sodium Chloride and Ammonium Chloride are soluble in water. So, only the solution of chalk and water will give residue on a filter paper.

Answer is
$\huge{\boxed{Chalk+Water}}$

Answer 2

Answer:

(c). Chalk+Water

Explanation:

Since Chalk is not soluble in water, it will give a residue on filter paper.